Fixture Vents
NYC Plumbing Code § PC 909
in effectSection PC 909: Fixture Vents
909.1 Distance of trap from vent.
Each fixture trap shall have a protecting vent located so that the slope and the developed length in the fixture drain from the trap weir to the vent fitting are within the requirements set forth in Table 909.1.
Exception: The developed length of the fixture drain from the trap weir to the vent fitting for self- siphoning fixtures, such as water closets, shall not be limited.
Table 909.1
Maximum Distance of Fixture Trap from Vent
Size of Trap (inches) Slope (inch per foot) Distance from Trap (feet)
1 1/4 1/4 5
1 1/2 1/4 6
2 1/4 8
3 1/8 12
4 1/8 16
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 inch per foot = 83.3 mm/m.
909.2 Venting of fixture drains.
The vent for a fixture drain, except where serving a fixture with integral traps, such as water closets, shall connect above the weir of the fixture trap being vented.
909.3 Crown vent.
A vent shall not be installed within two pipe diameters of the trap weir.
Source: City of New York, Charter, Administrative Code and Rules (American Legal Publishing XML export, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/newyorkcity/latest/NYCadmin/0-0-0-163106Fetched: 10/24/2026